A moving body of mass m and velocity v after colliding from a wall returns back (rebounds) with velocity v. The change in momentum will be
A
$$2 \,mv$$
B
$$mv$$
C
$$-mv$$
D
zero
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Solution
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Correct option is A. $$2 \,mv$$ $$∆P=P_i-P_f$$
$$∆P=mv-m(-v)$$
$$∆P=2mv$$
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